Slipper sizing

In my Etsy shop

Here are my slippers sizing for babies, infant girls and women in sizes I am able to manufacture at the moment. There is a gap between some age group but I'm working on to fill it with some new pairs of beautiful shoe lasts.

Please pay attention on insole length given below. It is accurate. The foot should flush to the wall while measuring. 
Tips and advises are welcome :) 

WOMEN

EU - METRIC - UK - US women

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EU 36 - 23,4 cm - UK 3 - US 6

EU 36.5 - 23,8 cm - UK 3.5 - US 6.5

EU 37 - 24,2 cm - UK 4 - US 7

EU 38 - 24,6 cm - UK 4.5 - US 7.5

EU 38.5 - 25 cm - UK 5 - US 8

EU 39 - 25,4 cm - UK 5.5 - US 8.5

EU 39.5 - 25,8 cm - UK 6 - US 9

EU 40 - 26,2 cm - UK 6.5 - US 9

EU 40.5 - 26,6 cm - UK 7 - US 9.5

EU 41 - 27 cm - UK 7,.5 - US 10

BABIES

0-3 months ~9cm inside 
3-6 months ~10 cm inside 
6-12 months ~ 11 cm inside 
12-18 months ~12 cm inside

GIRLS (Infant)

EU - METRIC - UK - US 

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EU 25 - 16.2 cm UK 7,5 - US 8
EU 26 - 17.2 cm UK 8,5 - US 9
EU 27 - 17.6 cm UK 9 - US 9,5 

EU 28 - 18.6 cm UK 10 - US 10,5

EU 29 - 19.6 cm UK 11 - US 12   

EU 30 - 20 cm UK 12 - US 12,5  

EU 31 - 20,6 cm UK 12,5 -  US 13 

*important - the most accurate way to choose a size is to measure feet length if possible. The foot should flush to the wall while measuring. Given centimeters are for INSOLE length.